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added comment on checks

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poma 2019-11-02 16:24:17 +03:00
parent 2ded1f8adb
commit 8a179b9217
1 changed files with 5 additions and 1 deletions
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contracts/MerkleTreeWithHistory.sol
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@ -46,7 +46,11 @@ contract MerkleTreeWithHistory {
} }
function hashLeftRight(uint256 _left, uint256 _right) public pure returns (uint256 hash) { function hashLeftRight(uint256 _left, uint256 _right) public pure returns (uint256 hash) {
uint256 R = _left; // left is already checked to be less than field_size by snark verifier // those checks should never trigger in practice, because they're already performed by the snark verifier
// added for convenience if someone decides to call this function directly
require(_left < FIELD_SIZE, "_left should be inside the field");
require(_right < FIELD_SIZE, "_right should be inside the field");
uint256 R = _left;
uint256 C = 0; uint256 C = 0;
(R, C) = Hasher.MiMCSponge(R, C, 0); (R, C) = Hasher.MiMCSponge(R, C, 0);